U.S. patent number 10,085,607 [Application Number 15/262,655] was granted by the patent office on 2018-10-02 for power supply apparatus, and electric apparatus and vacuum cleaner having the same.
This patent grant is currently assigned to RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, SAMSUNG ELECTRONICS CO., LTD.. The grantee listed for this patent is Research & Business Foundation SungKyunKwan University, SAMSUNG ELECTRONICS CO., LTD.. Invention is credited to Dong-Myoung Joo, Min Jae Kim, Min Jung Kim, Byoung-Kuk Lee, Dong-Hyun Lee, Young Jae Park, Hyo Won Sin.
United States Patent |
10,085,607 |
Park , et al. |
October 2, 2018 |
Power supply apparatus, and electric apparatus and vacuum cleaner
having the same
Abstract
Disclosed herein are a power supply apparatus, and an electric
apparatus and a vacuum cleaner having the power supply apparatus.
According to an aspect of the present disclosure, the power supply
apparatus includes: a first power converter configured to convert a
first Alternating Current (AC) voltage into a Direct Current (DC)
voltage; a second power converter configured to drop the DC voltage
output from the first power converter and transfer the dropped DC
voltage to a power storage unit, and to boost a DC voltage of the
power storage unit and output the boosted DC voltage; and a third
power converter configured to convert a DC voltage among the DC
voltage output from the first power converter and the boosted DC
voltage output from the second power converter, into a second AC
voltage, and to transfer the second AC voltage to a load.
Inventors: |
Park; Young Jae (Yongin-si,
KR), Kim; Min Jung (Suwon-si, KR), Joo;
Dong-Myoung (Suwon-si, KR), Kim; Min Jae
(Seongnam-si, KR), Sin; Hyo Won (Anseong-si,
KR), Lee; Dong-Hyun (Suwon-si, KR), Lee;
Byoung-Kuk (Yongin-si, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG ELECTRONICS CO., LTD.
Research & Business Foundation SungKyunKwan University |
Suwon-si
Suwon-si |
N/A
N/A |
KR
KR |
|
|
Assignee: |
RESEARCH & BUSINESS FOUNDATION
SUNGKYUNKWAN UNIVERSITY (Suwon-si, KR)
SAMSUNG ELECTRONICS CO., LTD. (Suwon-si, KR)
|
Family
ID: |
56117589 |
Appl.
No.: |
15/262,655 |
Filed: |
September 12, 2016 |
Prior Publication Data
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|
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Document
Identifier |
Publication Date |
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US 20170150860 A1 |
Jun 1, 2017 |
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Foreign Application Priority Data
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|
|
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Nov 30, 2015 [KR] |
|
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10-2015-0168715 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02M
7/44 (20130101); A47L 9/2884 (20130101); H02M
1/4208 (20130101); H02M 3/158 (20130101); H02P
27/06 (20130101); H02M 1/10 (20130101); H02J
7/0068 (20130101); H02M 3/08 (20130101); H02J
7/00 (20130101); H02M 7/04 (20130101); H02M
7/48 (20130101); H02J 9/062 (20130101); H02M
1/12 (20130101); A47L 9/2842 (20130101); H02K
7/14 (20130101) |
Current International
Class: |
H02P
1/00 (20060101); H02P 1/28 (20060101); H02J
7/00 (20060101); H02K 7/14 (20060101); H02P
27/06 (20060101); H02M 1/12 (20060101); H02P
3/00 (20060101); H02P 7/06 (20060101); A47L
9/28 (20060101); H02M 7/04 (20060101); H02M
3/08 (20060101); H02M 3/158 (20060101); H02M
7/44 (20060101); H02M 1/42 (20070101) |
Field of
Search: |
;318/504 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1 667 309 |
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Jun 2006 |
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EP |
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2 800 230 |
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Nov 2014 |
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EP |
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2004-56995 |
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Feb 2004 |
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JP |
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10-2013-0047144 |
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May 2013 |
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KR |
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10-2013-0072557 |
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Jul 2013 |
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KR |
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Other References
Extended European Search Report dated Apr. 21, 2017, in
corresponding European Patent Application No. 16173780.4. cited by
applicant.
|
Primary Examiner: Glass; Erick
Attorney, Agent or Firm: Staas & Halsey LLP
Claims
What is claimed is:
1. A power supply apparatus configured to select between an
Alternating Current (AC) power supply and a battery to supply power
to a motor, the power supply apparatus comprising: a first power
converter configured to convert a first AC voltage into a Direct
Current (DC) voltage, when the AC power supply is selected; a
second power converter configured to drop the DC voltage output
from the first power converter and transfer the dropped DC voltage
to the battery when the AC power supply is selected, and to boost a
DC voltage of the battery and output the boosted DC voltage when
the battery is selected; a third power converter configured to
convert a DC voltage among the DC voltage output from the first
power converter and the boosted DC voltage output from the second
power converter, into a second AC voltage, and to transfer the
second AC voltage to the motor; and a controller configured to
control the second power converter to drop and boost the DC
voltage, and to control the third power converter to convert the DC
voltage into the second AC voltage.
2. The power supply apparatus according to claim 1, wherein the
second power converter is a bidirectional DC-DC converter
configured to drop the DC voltage output from the first power
converter and transfer the dropped DC voltage in a first direction
to charge the power storage unit, and to boost a charged DC voltage
of the power storage unit and output the boosted DC voltage in a
second direction which is opposite to the first direction to thus
transfer the boosted DC voltage to the third power converter.
3. The power supply apparatus according to claim 2, wherein the
second power converter operates as a buck converter when
transferring the dropped DC voltage in the first direction, and
operates as a boost converter when transferring the boosted DC
voltage in the second direction.
4. The power supply apparatus according to claim 3, wherein the
controller controls the second power converter to operate as the
buck converter in order to transfer the DC voltage output from the
first power converter to the power storage unit; and the controller
controls the second power converter to operate as the boost
converter in order to boost the DC voltage of the power storage
unit and transfer the boosted DC voltage to the load.
5. The power supply apparatus according to claim 1, wherein the
third power converter is an inverter configured to convert the DC
voltage into the second AC voltage having a frequency and a phase
required by the load.
6. The power supply apparatus according to claim 1, wherein the
first power converter is a Power Factor Corrector (PFC) configured
to convert the first AC voltage into the DC voltage to suppress
harmonic-wave current of the first AC voltage and improve a power
factor of the first AC voltage.
7. The power supply apparatus according to claim 1, further
comprising a capacitor electrically connected between the first
power converter and the second power converter, wherein the
capacitor is charged by at least one voltage of the DC voltage
output from the first power converter and the boosted DC voltage
output from the second power converter.
8. The power supply apparatus according to claim 7, wherein the
charged voltage of the capacitor is transferred to the third power
converter.
9. The power supply apparatus according to claim 1, further
comprising an AC input detector configured to detect the first AC
voltage input to the first power converter, and to transfer the
result of the detection to the controller.
10. The power supply apparatus according to claim 1, wherein the
controller generates a first control signal for controlling a power
transfer direction of the second power converter, and a second
control signal for controlling conversion operation of the third
power converter.
11. An electric apparatus comprising: a fan; a motor configured to
rotate the fan; a battery configured to store a voltage; a first
power converter configured to convert a first Alternating Current
(AC) voltage into a Direct Current (DC) voltage, when the AC power
supply is selected; a second power converter configured to drop the
DC voltage output from the first power converter and transfer the
dropped DC voltage to the battery when the AC power supply is
selected, and to boost a DC voltage of the battery and output the
boosted DC voltage when the battery is selected; a third power
converter configured to convert a DC voltage of the DC voltage
output from the first power converter and the boosted DC voltage
output from the second power converter, into a second AC voltage,
and to transfer the second AC voltage to the motor; and a
controller configured to control the second power converter to drop
and boost the DC voltage, and to control the third power converter
to convert the DC voltage into the second AC voltage.
12. The electric apparatus according to claim 11, wherein the
second power converter is a bidirectional DC-DC converter
configured to drop the DC voltage output from the first power
converter and transfer the dropped DC voltage in a first direction
to charge the battery, and to boost a charged DC voltage of the
battery and output the boosted DC voltage in a second direction
which is opposite to the first direction to thus transfer the
boosted DC voltage to the third power converter.
13. The electric apparatus according to claim 12, wherein the
second power converter operates as a buck converter when
transferring the dropped DC voltage in the first direction, and
operates as a boost converter when transferring the boosted DC
voltage in the second direction.
14. The electric apparatus according to claim 13, wherein the
controller controls the second power converter to operate as the
buck converter in order to transfer the DC voltage output from the
first power converter to the battery; and the controller controls
the second power converter to operate as the boost converter in
order to boost the charged DC voltage of the battery and transfer
the boosted DC voltage to the motor.
15. The electric apparatus according to claim 11, wherein the third
power converter is an inverter configured to convert the DC voltage
into the second AC voltage having a frequency and phase required by
the motor.
16. The electric apparatus according to claim 11, wherein the first
power converter is a Power Factor Corrector (PFC) configured to
convert the first AC voltage into the DC voltage to suppress
harmonic-wave current of the first AC voltage and improve a power
factor of the first AC voltage.
17. The electric apparatus according to claim 16, wherein the PFC
is an isolated PFC.
18. The electric apparatus according to claim 11, further
comprising a capacitor electrically connected between the first
power converter and the second power converter, wherein the
capacitor is charged by at least one voltage of the DC voltage
output from the first power converter and the boosted DC voltage
output from the second power converter.
19. The electric apparatus according to claim 11, wherein the
controller generates a first control signal for controlling a power
transfer direction of the second power converter, and a second
control signal for controlling conversion operation of the third
power converter.
20. An Alternating Current (AC)/Direct Current (DC) power supply
apparatus configured to select between an AC power supply and a
battery to supply power to a motor, the power supply apparatus
comprising: an isolated Power Factor Corrector (PFC) configured to
convert a commercial AC voltage into a DC voltage, when the AC
power supply is selected; a bidirectional DC-DC converter
configured to drop the DC voltage output from the isolated PFC and
transfer the dropped DC voltage to the battery when the AC power
supply is selected, and to boost a DC voltage of the battery and
output the boosted DC voltage when the battery supply is selected;
an inverter configured to convert a frequency and phase of a DC
voltage of the DC voltage output from the isolated PFC and the
boosted DC voltage output from the bidirectional DC-DC converter,
and to transfer the DC voltage with the converted frequency and
phase to the motor; and a controller configured to control the
bidirectional DC-DC converter to drop and boost the DC voltage, and
to control the inverter to convert the frequency and phase of the
DC voltage.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of Korean Patent Application
No. 10-2015-0168715, filed on Nov. 30, 2015 in the Korean
Intellectual Property Office, the disclosure of which is
incorporated herein by reference.
BACKGROUND
1. Field
Embodiments of the present disclosure relate to a power supply
apparatus, and more particularly, to a power supply apparatus of a
vacuum cleaner.
2. Description of the Related Art
A cleaner is an electrical appliance that is used to remove foreign
materials indoors to clean an indoor environment. Recently, many
households use a vacuum cleaner. The vacuum cleaner is an
electrical appliance to suck in air containing foreign materials
from a surface to be cleaned, to separate the foreign materials
from the air and collect the foreign materials, and then to
discharge purified air to the outside of the main body of the
vacuum cleaner.
Such a vacuum cleaner is classified into a canister type and an
upright type.
A canister type cleaner includes a main body in which a blowing
unit and a dust-collecting unit are installed, a suction body
installed separately from the main body and configured to suck in
dust from a floor, and a connection pipe connecting the main body
to the suction body. Accordingly, a user grips a handle installed
on the connection pipe, and cleans a floor while moving the suction
body on the floor in a direction in which he/she wants to
clean.
The upright type cleaner includes a upright main body, and a
suction body coupled with the lower part of the main body to form
one body with the main body. Accordingly, a user grips a handle
provided at the upper part of the main body, and can clean a floor
while moving the entire main body of the upright cleaner.
The upright type cleaner installs a drum brush in the suction body
in order to enhance cleaning efficiency. The drum brush contacts a
surface to be cleaned while rotating at high speed to thus separate
foreign materials attached on the surface to be cleaned from the
surface to be cleaned, and the separated foreign materials are
sucked into the suction body and then collected in a
dust-collecting unit included in the main body.
SUMMARY
Therefore, it is an aspect of the present disclosure to provide a
Direct Current (DC)/Alternating Current (AC) power supply apparatus
capable of maintaining an input voltage of an inverter at a
constant level.
Additional aspects of the disclosure will be set forth in part in
the description which follows and, in part, will be obvious from
the description, or may be learned by practice of the
disclosure.
In accordance with one aspect of the present disclosure, a power
supply apparatus includes: a first power converter configured to
convert a first Alternating Current (AC) voltage into a Direct
Current (DC) voltage; a second power converter configured to drop
the DC voltage output from the first power converter and transfer
the dropped DC voltage to a power storage unit, and to boost a DC
voltage of the power storage unit and output the boosted DC
voltage; a third power converter configured to convert a DC voltage
among the DC voltage output from the first power converter and the
boosted DC voltage output from the second power converter, into a
second AC voltage, and to transfer the second AC voltage to a load;
and a controller configured to control the second power converter
to drop and boost the DC voltage, and to control the third power
converter to convert the DC voltage into the second AC voltage.
In the power supply apparatus, the second power converter may be a
bidirectional DC-DC converter configured to drop the DC voltage
output from the first power converter and transfer the dropped DC
voltage in a first direction to charge the power storage unit, and
to boost a charged DC voltage of the power storage unit and output
the boosted DC voltage in a second direction which is opposite to
the first direction to thus transfer the boosted DC voltage to the
third power converter.
In the power supply apparatus, the second power converter may
operate as a buck converter when transferring the dropped DC
voltage in the first direction, and operate as a boost converter
when transferring the boosted DC voltage in the second
direction.
In the power supply apparatus, the controller may control the
second power converter to operate as the buck converter in order to
transfer the DC voltage output from the first power converter to
the power storage unit; and the controller may control the second
power converter to operate as the boost converter in order to boost
the DC voltage of the power storage unit and transfer the boosted
DC voltage to the load.
In the power supply apparatus, the third power converter may be an
inverter configured to convert the DC voltage into the second AC
voltage having a frequency and a phase required by the load.
In the power supply apparatus, the first power converter may be a
Power Factor Corrector (PFC) configured to convert the first AC
voltage into the DC voltage to suppress harmonic-wave current of
the first AC voltage and improve a power factor of the first AC
voltage.
In the power supply apparatus, the PFC may be an isolated PFC.
The power supply apparatus may further include a capacitor
electrically connected between the first power converter and the
second power converter, wherein the capacitor may be charged by at
least one voltage of the DC voltage output from the first power
converter and the boosted DC voltage output from the second power
converter.
In the power supply apparatus, wherein the charged voltage of the
capacitor may be transferred to the third power converter.
The power supply apparatus may further include an AC input detector
configured to detect the first AC voltage input to the first power
converter, and to transfer the result of the detection to the
controller.
In the power supply apparatus, the controller may generate a first
control signal for controlling a power transfer direction of the
second power converter, and a second control signal for controlling
conversion operation of the third power converter.
In accordance with another aspect of the present disclosure, an
electric apparatus includes: a fan; a motor configured to rotate
the fan; a battery configured to store a voltage; a first power
converter configured to convert a first Alternating Current (AC)
voltage into a Direct Current (DC) voltage; a second power
converter configured to drop the DC voltage output from the first
power converter and transfer the dropped DC voltage to the battery,
and to boost a DC voltage of the battery and output the boosted DC
voltage; a third power converter configured to convert a DC voltage
of the DC voltage output from the first power converter and the
boosted DC voltage output from the second power converter, into a
second AC voltage, and to transfer the second AC voltage to the
motor; and a controller configured to control the second power
converter to drop and boost the DC voltage, and to control the
third power converter to convert the DC voltage into the second AC
voltage.
In the electric apparatus, the second power converter may be a
bidirectional DC-DC converter configured to drop the DC voltage
output from the first power converter and transfer the dropped DC
voltage in a first direction to charge the battery, and to boost a
charged DC voltage of the battery and output the boosted DC voltage
in a second direction which is opposite to the first direction to
thus transfer the boosted DC voltage to the third power
converter.
In the electric apparatus, the second power converter may operate
as a buck converter when transferring the dropped DC voltage in the
first direction, and operate as a boost converter when transferring
the boosted DC voltage in the second direction.
In the electric apparatus, the controller may control the second
power converter to operate as the buck converter in order to
transfer the DC voltage output from the first power converter to
the battery; and the controller may control the second power
converter to operate as the boost converter in order to boost the
charged DC voltage of the battery and transfer the boosted DC
voltage to the motor.
In the electric apparatus, the third power converter may be an
inverter configured to convert the DC voltage into the second AC
voltage having a frequency and phase required by the motor.
In the electric apparatus, the first power converter may be a Power
Factor Corrector (PFC) configured to convert the first AC voltage
into the DC voltage to suppress harmonic-wave current of the first
AC voltage and improve a power factor of the first AC voltage.
In the electric apparatus, the PFC may be an isolated PFC.
The electric apparatus may further include a capacitor electrically
connected between the first power converter and the second power
converter, wherein the capacitor may be charged by at least one
voltage of the DC voltage output from the first power converter and
the boosted DC voltage output from the second power converter.
In the electric apparatus, the charged voltage of the capacitor may
be transferred to the third power converter.
The electric apparatus may further include an AC input detector
configured to detect the first AC voltage input to the first power
converter, and to transfer the result of the detection to the
controller.
In the electric apparatus, the controller may generate a first
control signal for controlling a power transfer direction of the
second power converter, and a second control signal for controlling
conversion operation of the third power converter.
In accordance with another aspect of the present disclosure, a
vacuum cleaner includes: a first power converter configured to
convert a first Alternating Current (AC) voltage into a Direct
Current (DC) voltage; a second power converter configured to drop
the DC voltage output from the first power converter and transfer
the dropped DC voltage to a power storage unit, and to boost a DC
voltage of the power storage unit and output the boosted DC
voltage; a third power converter configured to convert a DC voltage
of the DC voltage output from the first power converter and the
boosted DC voltage output from the second power converter, into a
second AC voltage, and to transfer the second AC voltage to a load;
and a controller configured to control the second power converter
to drop and boost the DC voltage, and to control the third power
converter to convert the DC voltage into the second AC voltage.
In accordance with another aspect of the present disclosure, a
vacuum cleaner includes: a fan; a motor configured to rotate the
fan; a battery configured to store a voltage; a first power
converter configured to convert a first Alternating Current (AC)
voltage into a Direct Current (DC) voltage; a second power
converter configured to drop the DC voltage output from the first
power converter and transfer the dropped DC voltage to the battery,
and to boost a DC voltage of the battery and output the boosted DC
voltage; a third power converter configured to convert a DC voltage
of the DC voltage output from the first power converter and the
boosted DC voltage output from the second power converter, into a
second AC voltage, and to transfer the second AC voltage to the
motor; and a controller configured to control the second power
converter to drop and boost the DC voltage, and to control the
third power converter to convert the DC voltage into the second AC
voltage.
In accordance with another aspect of the present disclosure, an
Alternating Current (AC)/Direct Current (DC) power supply apparatus
includes: an isolated Power Factor Corrector (PFC) configured to
convert a commercial AC voltage into a DC voltage; a bidirectional
DC-DC converter configured to drop the DC voltage output from the
isolated PFC and transfer the dropped DC voltage to a battery, and
to boost a DC voltage of the battery and output the boosted DC
voltage; an inverter configured to convert a frequency and phase of
a DC voltage of the DC voltage output from the isolated PFC and the
boosted DC voltage output from the bidirectional DC-DC converter,
and to transfer the DC voltage with the converted frequency and
phase to a load; and a controller configured to control the
bidirectional DC-DC converter to drop and boost the DC voltage, and
to control the inverter to convert the frequency and phase of the
DC voltage.
BRIEF DESCRIPTION OF THE DRAWINGS
These and/or other aspects of the disclosure will become apparent
and more readily appreciated from the following description of the
embodiments, taken in conjunction with the accompanying drawings of
which:
FIG. 1 shows an outer appearance of a vacuum cleaner according to
an embodiment of the present disclosure;
FIG. 2 schematically shows an internal structure of a vacuum
cleaner according to an embodiment of the present disclosure;
FIG. 3 is a block diagram of a power supply apparatus of a vacuum
cleaner according to an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of a bidirectional Direct Current
(DC)-DC converter of the power supply apparatus shown in FIG.
3;
FIG. 5 are a circuit diagram and signal flow graphs of the
bidirectional DC-DC converter shown in FIG. 4 when the
bidirectional DC-DC converter operates as a voltage drop
circuit;
FIG. 6 are a circuit diagram and signal flow graphs of the
bidirectional DC-DC converter shown in FIG. 4 when the
bidirectional DC-DC converter operates as a voltage boosting
circuit;
FIG. 7 shows a power supply path when a power supply apparatus of a
vacuum cleaner according to an embodiment of the present disclosure
operates in a charging mode;
FIG. 8 shows a power supply path when a power supply apparatus of a
vacuum cleaner according to an embodiment of the present disclosure
operates in a DC mode; and
FIG. 9 shows a power supply path when a power supply apparatus of a
vacuum cleaner according to an embodiment of the present disclosure
operates in an alternating current (AC) mode.
DETAILED DESCRIPTION
FIG. 1 shows an outer appearance of a vacuum cleaner according to
an embodiment of the present disclosure, wherein FIG. 1A shows a
canister type vacuum cleaner, and FIG. 1B shows a upright type
vacuum cleaner.
A canister type vacuum cleaner 100 shown in FIG. 1A may include a
main body 102 configured to generate a suction force, a suction
brush 104 contacting a surface to be cleaned and configured to suck
in air, an extension pipe 106 connected to the suction brush 104,
and a cyclone dust-collecting unit 108 installed in the extension
pipe 106. The cyclone dust-collecting unit 108 may generate
swirling air flow to separate dust from the air by a centrifugal
force. The main body 102 may include a fan motor (not shown)
configured to generate a suction force. The suction brush 104 may
suck in air and dust included in the air on a surface to be
cleaned, by the suction force generated by the main body 102. The
suction brush 104 may be formed in a wide and flat shape such that
it can closely contact the surface to be cleaned. Between the main
body 102 and the suction brush 104, the extension pipe 106 made of
a resin or a metal, a handle pipe 110 for a user's manipulations,
and a flexible hose 112 made of a flexible material and configured
to freely move the handle pipe 110 may be provided. In the handle
pipe 110, a manipulation unit 114 to enable a user to manipulate
functions of the vacuum cleaner 100 may be provided. The cyclone
dust-collecting unit 108 may be coupled between the extension pipe
106 and the handle pipe 110. The suction brush 104, the extension
pipe 106, the cyclone dust-collecting unit 108, the handle pipe
110, and the flexible hose 112 may be configured to communicate
with each other. Air sucked through the suction brush 104 may enter
the cyclone dust-collecting unit 108 through the extension pipe
106. The cyclone dust-collecting unit 108 may generate swirling air
flow to separate dust from the air by a centrifugal force and then
collect the dust. The air purified by the cyclone dust-collecting
unit 108 may pass through the handle pipe 110 and the flexible hose
112 sequentially, and then enter the main body 102. The cyclone
dust-collecting unit 108 may be positioned between the extension
pipe 106 and the handle pipe 110 to separate dust from air and
collect the dust before the air enters the main body 102.
A upright type vacuum cleaner 150 shown in FIG. 1B may include a
suction brush 154 configured to suck in foreign materials such as
hair on a surface (for example, a floor and a carpet) to be cleaned
by a suction force, and a cleaner main body 152 configured to
collect the foreign materials sucked through the suction brush 154.
The cleaner main body 152 may include a motor (not shown)
configured to generate a suction force for sucking in foreign
materials on a surface to be cleaned, and a dust-collecting unit
(not shown) configured to collect the foreign materials sucked from
the surface to be cleaned. The cleaner main body 152 may be
directly connected to the suction brush 154, not via a separate
hose or the like. In the upper part of the cleaner main body 152, a
handle 178 may be provided to enable a user's manipulations. The
handle 178 may include a switch 164 to turn on/off the motor.
Accordingly, if a user grips the handle 178, manipulates the switch
164 to turn on the motor, and then moves the cleaner main body 152
on a surface to be cleaned, dust and foreign materials on the
surface to be cleaned may be sucked in through the suction brush
154 and collected in the cleaner main body 152.
The present disclosure relates to a power supply apparatus for
supplying power to a Direct Current (DC)/Alternating Current (AC)
electric apparatus, and an electric apparatus including the power
supply apparatus, and may be applied to the canister type vacuum
cleaner 100 and the upright type vacuum cleaner 150 shown in FIG.
1. However, the power supply apparatus according to the present
disclosure may be applied to another type of a vacuum cleaner, or
to another kind of an electric apparatus (for example, for DC/AC
combined use) than a vacuum cleaner.
FIG. 2 schematically shows an internal structure of a vacuum
cleaner according to an embodiment of the present disclosure. As
shown in FIG. 2, a fan 202 (for example, a centrifugal fan) may
rotate to generate a suction force. The suction force generated by
the rotation of the fan 202 may cause foreign materials and air to
be sucked into the inside of the vacuum cleaner 100 (or 150)
through the suction brush 104 (or 154) described above with
reference to FIG. 1. The foreign materials and air sucked through
the suction brush 104 (or 154) may pass through a dual filter 204
via the fan 202 so that the foreign materials are filtered out by
the dual filter 204 and the air is discharged to the outside of the
vacuum cleaner 100 (or 150).
In order to generate a suction force in the vacuum cleaner 100 (or
150) according to an embodiment of the present disclosure, it is
necessary to rotate the fan 202. A motor 206 may be provided to
rotate the fan 202. That is, a rotational force generated by the
motor 206 may rotate the fan 202 to generate a suction force. In
order to rotate the motor 206, power needs to be supplied to the
motor 206. The power that is supplied to the motor 206 may be DC.
However, a process of generating DC that is supplied to the motor
206 may be different between the cases of commercial AC power and
battery charging power. That is, in the case of commercial AC
power, commercial AC power may be received through a cord 116 (or
166) connected to a socket 212, converted into DC, then converted
into an AC signal of a desired frequency and phase, and then
applied to the motor 206. In the case of battery charging power,
battery charging power may be directly converted into an AC signal
of a desired frequency and phase and then applied to the motor 206,
since the battery charging power itself is DC power. If the motor
206 is driven by battery charging power, it is unnecessary to
connect the cord 116 (or 166) to the socket 212 during cleaning,
and accordingly, the vacuum cleaner 100 (or 150) can be used as a
cordless type, which increases a user's convenience. In contrast,
if the motor 206 is driven by commercial AC power, it is necessary
to connect the cord 116 (or 166) to the socket 212 during cleaning.
However, in this case, since the motor 206 can be strongly driven
using the high voltage of the commercial AC power, a stronger
suction force can be generated.
The vacuum cleaner 100 (or 150) shown in FIG. 1 may be a DC/AC
vacuum cleaner. That is, the vacuum cleaner 100 (or 150) shown in
FIG. 1 may use a method of selecting one of battery charging power
and commercial AC power to drive the motor 206. A power supply
apparatus 208 as shown in FIG. 2 may convert commercial AC power
into an AC signal of a desired frequency and phase, and supply the
AC signal to the motor 206, when the cord 116 (or 166) is connected
to the socket 212 so that the commercial AC power is supplied. If
the cord 116 (or 166) is disconnected from the socket 212 so that
no commercial AC power is supplied, the power supply apparatus 208
may convert DC power charged in a battery 210 into an AC signal of
a desired frequency and phase, and supply the AC signal to the
motor 206. The battery 210 may be charged when the cord 116 (or
166) is connected to the socket 212 so that commercial AC power is
supplied to the power supply apparatus 208.
FIG. 3 is a block diagram of the power supply apparatus 208 of the
vacuum cleaner 100 (or 150) according to an embodiment of the
present disclosure. The vacuum cleaner 100 (or 150) may be a DC/AC
vacuum cleaner, as described above with reference to FIG. 2. The
power supply apparatus 208 shown in FIG. 3 may be used to implement
the DC/AC vacuum cleaner 100 (or 150).
A controller 302 may control overall operations of the power supply
apparatus 208. Particularly, the controller 302 may generate a
first control signal and a second control signal to control a
charging mode for charging the battery 210, an AC mode for
converting commercial AC power into an AC signal of a desired
frequency and phase and supplying the AC signal to the motor 206,
and a DC mode for converting DC power charged in the battery 210
into an AC signal of a desired frequency and phase and supplying
the AC signal to the motor 206. The first control signal generated
by the controller 302 may control the charging mode, the AC mode,
and the DC mode. Also, the second control signal generated by the
controller 302 may control an inverter 310 to generate power of a
frequency and phase required for driving the motor 206 and transfer
the power to the motor 206. The controller 302 may determine
whether commercial AC power is received, through an AC input
detector 304, and control the charging mode, the AC mode, and the
DC mode, according to the result of the determination.
The AC input detector 304 may detect commercial AC power that is
input to an isolated Power Factor Corrector (PFC) 306 which will be
described later, and provide the result of the detection to the
controller 302. That is, if the cord 116 (or 166) is connected to
the socket 212 so that commercial AC power is input to the isolated
PFC 306 of the power supply apparatus 208 of the vacuum cleaner 100
(or 150), as described above with reference to FIG. 2, the AC input
detector 304 may detect the commercial AC power, and provide the
result of the detection to the controller 302.
The isolated PFC 306 may convert the commercial AC power into DC.
That is, the isolated PFC 306 may convert commercial AC power which
is AC into DC, and transfer the DC to a bidirectional DC-DC
converter 308 or the inverter 310. The isolated PFC 306 may
contribute to suppression of harmonic-wave current and improvement
of a power factor, when converting the commercial AC power into DC.
The output voltage of the isolated PFC 306 may be about 310V. A
capacitor C1 may be connected between the isolated PFC 306 and the
bidirectional DC-DC converter 308. The capacitor C1 may be charged
by at least one of the isolated PFC 306 and the bidirectional DC-DC
converter 308.
The bidirectional DC-DC converter 308 may transfer a DC voltage
output from the isolated PFC 306 to the battery 210 so as to charge
the battery 210 (a first direction path), or may transfer a charged
voltage of the battery 210 to the inverter 310 (a second direction
path). The power transfer of the bidirectional DC-DC converter 308
through the first direction path and the second direction path may
be controlled by the first control signal from the controller 302.
The controller 302 may generate the first control signal to
activate one of the first direction path and the second direction
path of the bidirectional DC-DC converter 308 so as to transfer a
DC voltage through the activated path. An output voltage of the
first direction path of the bidirectional DC-DC converter 308 may
be 310V, and an output voltage of the second direction path may be
21.6V. The output voltage 310V of the first direction path may be a
voltage resulting from converting the commercial AC power into DC,
and may be another voltage, instead of 310V, according to the
commercial AC power and the rating of the isolated PFC 306. The
output voltage 21.6V of the second direction path may be obtained
since the battery 210 is configured with 6 cells and each cell has
a voltage of 3.6V. If the battery 210 is configured with a
different number of cells and each cell has a different voltage,
the output voltage of the second direction path of the
bidirectional DC-DC converter 308 may also change accordingly. The
battery 210 may be charged by receiving a DC voltage through the
bidirectional DC-DC converter 308 (charging mode). The charged
voltage of the battery 210 may be transferred to the inverter 310
through the bidirectional DC-DC converter 308 (DC mode).
The inverter 310 may convert the received DC voltage into a signal
of a desired frequency and phase, and provide the signal to the
motor 206. The DC voltage input to the inverter 310 may be one of
the DC voltage converted by the isolated PFC 306 and the DC voltage
charged in the battery 210. The inverter 310 may be controlled by
the second control signal from the controller 302. The controller
302 may generate the second control signal to control the inverter
310 in order to generate DC power of a frequency and phase required
for driving the motor 206.
FIG. 4 is a circuit diagram of the bidirectional DC-DC converter
308 of the power supply apparatus 208 shown in FIG. 3. As shown in
FIG. 4, both output terminals of the bidirectional DC-DC converter
308 may be connected to a first power line 402 and a second power
line 404, respectively. A first switching device S1 and an inductor
L may be connected in series to the first power line 402. Also, a
second switching device S2 may be connected between the second
power line 404 and a node of connecting the first switching device
S1 to the inductor L on the first power line 402. Also, a capacitor
C2 may be connected between the second power line 404 and a node of
connecting the inductor L to the output terminal of the first
direction path on the first power line 402. The first switching
device S1 and the second switching device S2 may be switched on/off
by a third control signal from the controller 302. If any one of
the first switching device S1 and the second switching device S2 is
switched off and the other one is switched on/off repeatedly under
the control of the controller 302, the bidirectional DC-DC
converter 308 may operate as any one of a buck converter which is a
voltage drop circuit and a boost converter which is a voltage
boosting circuit. This operation will be described with reference
to FIGS. 5 and 6, below.
FIG. 5 are a circuit diagram and signal flow graphs of the
bidirectional DC-DC converter 308 shown in FIG. 4 when the
bidirectional DC-DC converter 308 operates as a voltage drop
circuit. In FIG. 5, the bidirectional DC-DC converter 308 may
operate in the charging mode for charging the battery 210.
Accordingly, the bidirectional DC-DC converter 308 may drop a
voltage of 310V input to the bidirectional DC-DC converter 308 to
21.6V which is the rated voltage of the battery 210, and transfer
21.6V to the battery 210.
FIG. 5A shows an equivalent circuit of the bidirectional DC-DC
converter 308 when the bidirectional DC-DC converter 308 operates
as a buck converter which is a voltage drop circuit. In the
equivalent circuit shown in FIG. 5A, the first switching device S1
may perform switching operation of repetitive switching on/off, and
the second switching device S2 may be maintained in a switched-off
state to operate as a diode. FIG. 5B shows a voltage at both
terminals of the diode (that is, the switching device S2 maintained
in the switched-off state) when the first switching device S1 is
repeatedly switched on/off. FIG. 5C shows a voltage at both
terminals of the capacitor C2 that is charged by the voltage at
both terminals of the diode (that is, the second switching device
S2 maintained in the switched-off state) when the first switching
device S1 is repeatedly switched on/off.
When the first switch device S1 is switched on, current may flow to
the inductor L so as to accumulate energy in the inductor L1, and
also, current may increasingly flow to the capacitor C2 and a load
(that is, the battery 210). When the first switch S1 is switched
off, the diode (that is, the second switching device S2 maintained
in the switched-off state) may form a current path to make inductor
current which is energy accumulated in the inductor L flow to the
capacitor C2 and the load (that is, the battery 210). The inductor
current of the inductor L may be reduced until the first switching
device S1 is switched on.
As such, by periodically switching on/off the first switching
device S1 to smoothen a pulsed voltage as shown in FIG. 5B through
the inductor L and the capacitor C2, a DC voltage as shown in FIG.
5C may be generated. At this time, an output voltage V.sub.out may
be lower than an input voltage V.sub.in (voltage drop effect). That
is, when the input voltage V.sub.in of the bidirectional DC-DC
converter 308 shown in FIG. 5A is 310V, the output voltage
V.sub.out of the bidirectional DC-DC converter 308 may become 21.6V
by the voltage drop effect.
FIG. 6 are a circuit diagram and signal flow graphs of the
bidirectional DC-DC converter 308 shown in FIG. 4 when the
bidirectional DC-DC converter 308 operates as a voltage boosting
circuit. In FIG. 6, the bidirectional DC-DC converter 308 may
operate in the DC mode for boosting the charged voltage 21.6V of
the battery 210 and transferring the boosted voltage to the
inverter 310. Accordingly, the voltage of 21.6V input to the
bidirectional DC-DC converter 308 may be boosted to 310V which is
an input voltage of the inverter 310.
FIG. 6A shows an equivalent circuit of the bidirectional DC-DC
converter 308 when the bidirectional DC-DC converter 308 operates
as a boost converter which is a voltage boosting circuit. In the
equivalent circuit of FIG. 6A, the second switching device S2 may
perform switching operation of repetitive switching on/off, and the
first switching device S1 may be maintained in a switched-off state
to operate as a diode. FIG. 6B shows a voltage at both terminals of
the diode (that is, the first switching device S1 maintained in the
switched-off state) when the second switching device S2 is
repeatedly switched on/off. FIG. 6C shows a voltage at both
terminals of the capacitor C1 that is charged by the voltage at
both terminals of the diode (that is, the first switching device S1
maintained in the switched-off state) when the second switching
device S2 is repeatedly switched on/off.
When the second switch device S2 is switched on, current may flow
to an inductor L to accumulate energy in the inductor L, and energy
accumulated in a capacitor C1 may be consumed by the load (that is,
the inverter 310). At this time, the diode (that is, the first
switching device S1 maintained in the switched-off state) may block
charges accumulated in the capacitor C1 from flowing to the second
switch device S2. When the second switch device S2 is switched off,
energy VL accumulated in the inductor L may be added to the input
voltage V.sub.i so that the output voltage V.sub.out=V.sub.i+VL.
Accordingly, the output voltage V.sub.out boosted by the energy VL
accumulated in the inductor L can be obtained.
As such, by periodically switching on/off the second switching
device S2 to smoothen a pulsed voltage as shown in FIG. 6B through
the inductor L and the capacitor C1, a DC voltage as shown in FIG.
6C may be generated. At this time, the output voltage V.sub.out may
be higher than the input voltage V.sub.in (voltage boosting
effect). That is, when the input voltage V.sub.in of the
bidirectional DC-DC converter 308 shown in FIG. 6A is 21.6V, the
output voltage V.sub.out of the bidirectional DC-DC converter 308
may become 310V by the voltage boosting effect.
FIG. 7 shows a power supply path when the power supply apparatus
208 of the vacuum cleaner 100 (or 150) according to an embodiment
of the present disclosure operates in the charging mode. As shown
in FIG. 7, when the power supply apparatus 208 of the vacuum
cleaner 100 (or 150) according to an embodiment of the present
disclosure operates in the charging mode, power may be supplied in
such a way that DC generated in the isolated PFC 306 is transferred
to the battery 210 through the bidirectional DC-DC converter
308.
If commercial AC power is converted into DC power of about 310V by
the isolated PFC 306, the capacitor C1 may be charged to 310V. The
charged voltage 310V of the capacitor C1 may drop to 21.6V through
the first direction path (see FIG. 5) of the bidirectional DC-DC
converter 308, and the voltage of 21.6V may be transferred to the
battery 210 to charge the battery 210.
For this, the controller 302 may activate the first direction path
of the bidirectional DC-DC converter 308 using the first control
signal, as described above with reference to FIG. 5. Also, the
controller 302 may deactivate the inverter 310 using the second
control signal to prevent power from being supplied to the motor
206. Thereby, when the power supply apparatus 208 of the vacuum
cleaner 100 (or 150) according to an embodiment of the present
disclosure is in the charging mode, only the battery 210 may be
charged.
FIG. 8 shows a power supply path when the power supply apparatus
208 of the vacuum cleaner 100 (or 150) according to an embodiment
of the present disclosure operates in the DC mode. As shown in FIG.
8, when the power supply apparatus 208 of the vacuum cleaner 100
(or 150) according to an embodiment of the present disclosure
operates in the DC mode, power may be supplied in such a way that a
charged voltage of the battery 210 is transferred to the inverter
310 through the bidirectional DC-DC converter 308.
When the power supply apparatus 208 is in the DC mode, a charged
voltage 21.6V of the battery 210 may be boosted to a DC voltage of
310V through the second direction path (see FIG. 6) of the
bidirectional DC-DC converter 308, and the DC voltage of 310V may
be transferred to the inverter 310. The inverter 310 may convert
the frequency and phase of the DC voltage of 310V, and transfer the
DC voltage with the converted frequency and phase to the motor 206
to rotate the motor 206.
For this, the controller 302 may activate the second direction path
of the bidirectional DC-DC converter 308 using the first control
signal, as described above with reference to FIG. 6. Also, the
controller 302 may activate the inverter 310 using the second
control signal to supply the voltage of 310V to the motor 206.
Thereby, when the power supply apparatus 208 of the vacuum cleaner
100 (or 150) according to an embodiment of the present disclosure
is in the DC mode, the voltage of 310V may be supplied to the motor
206 through the inverter 310.
FIG. 9 shows a power supply path when the power supply apparatus
208 of the vacuum cleaner 100 (or 150) according to an embodiment
of the present disclosure operates in the AC mode. As shown in FIG.
9, when the power supply apparatus 208 of the vacuum cleaner 100
(or 150) according to an embodiment of the present disclosure
operates in the AC mode, power may be supplied in such a way that
DC generated by the isolated PFC 306 is directly transferred to the
inverter 310.
If commercial AC power is converted into DC power of about 310V by
the isolated PFC 306, the capacitor C1 may be charged to a DC
voltage of 310V. The DC voltage of 310V charged in the capacitor C1
may be directly transferred to the inverter 310. The inverter 310
may convert the frequency and phase of the DC voltage of 310V, and
transfer the DC voltage with the converted frequency and phase to
the motor 206 to rotate the motor 206.
For this, the controller 302 may deactivate the bidirectional DC-DC
converter 308 using the first control signal. Also, the controller
302 may activate the inverter 310 using the second control signal
to convert the frequency and phase of the DC voltage of 310V and
transfer the DC voltage with the converted frequency and phase to
the motor 206. Thereby, when the power supply apparatus 208 of the
vacuum cleaner 100 (or 150) according to an embodiment of the
present disclosure is in the AC mode, the voltage of 310V may be
supplied to the motor 206 through the inverter 310, like when the
power supply apparatus 208 is in the DC mode.
As described above, the power supply apparatus 208 according to an
embodiment of the present disclosure may provide the charging mode,
the DC mode, and the AC mode. As shown in FIGS. 7, 8, and 9, a
constant voltage of 310V may be applied to the input terminal of
the inverter 310 in each of the charging mode, the DC mode, and the
AC mode of the power supply apparatus 208.
That is, in the DC mode in which the charged voltage of the battery
210 is used, the input voltage of the inverter 310 may be 310V.
Also, in the AC mode in which commercial AC power is used, the
input voltage of the inverter 310 may be 310V. Also, in the
charging mode, although no power is transferred to the motor 206,
the input terminal of the inverter 310 may be maintained at the
high voltage of 310V. Herein, the voltage of 310V may be an example
of a high voltage that is supplied to the inverter 310, and may be
another voltage level required for driving a load (for example, the
motor 206).
If different levels of voltages (for example, 310V and 21.6V) are
applied to the inverter 310 for DC/AC combined use, the inverter
310 needs to be designed in consideration of both inputs of 310V
and 21.6V, which makes the structure of the power supply apparatus
208 complicated, increases the size of the power supply apparatus
208, and also increases the manufacturing cost of the power supply
apparatus 208.
However, in the power supply apparatus 208 according to an
embodiment of the present disclosure, since the input voltage of
the inverter 310 is maintained at a constant level although the
power supply apparatus 208 is for DC/AC combined use, the inverter
310 can be designed in consideration of a voltage level (for
example, 310V), thereby simplifying the structure of the power
supply apparatus 208, reducing the size of the power supply
apparatus 208, and also reducing the manufacturing cost of the
power supply apparatus 208.
According to an aspect of the present disclosure, since the input
voltage of the inverter is maintained at a constant level in the
DC/AC power supply apparatus, the inverter can be designed in
consideration of a voltage level, thereby simplifying the structure
of the power supply apparatus, reducing the size of the power
supply apparatus, and reducing the manufacturing cost of the power
supply apparatus.
Although a few embodiments of the present disclosure have been
shown and described, it would be appreciated by those skilled in
the art that changes may be made in these embodiments without
departing from the principles and spirit of the disclosure, the
scope of which is defined in the claims and their equivalents.
* * * * *